$ relaxer -dtd hello.rlx
generate DTD
<!-- Generated by Relaxer 0.10.1b --> <!-- Tue Aug 01 23:46:03 JST 2000 --> <!ELEMENT greeting (title, message)> <!ATTLIST greeting seqNo CDATA #REQUIRED> <!ATTLIST greeting to CDATA #REQUIRED> <!ATTLIST greeting from CDATA #REQUIRED> <!ELEMENT message (#PCDATA)> <!ELEMENT title (#PCDATA)>